2a. Request Dispatcher

index.html

<html>
<head>
<title>Login Form</title>
</head>
<form action="LoginServlet" >
 Enter User ID<input type="text" name="txtId"><br>
Enter Password<input type="password" name="txtpass"><br>
<input type="reset">
<input type="submit" value=" Click to Login " >
</form>
</html>



LoginServlet.java

package mypack;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.RequestDispatcher; 
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8);
PrintWriter out = response.getWriter();
out.println("<html><head>");
out.println("<title>Servlet LoginServlet</title></head>"); String uname = request.getParameter("txtId");
String upass = request.getParameter("txtPass");
if(uname.equals("admin") && upass.equals("servlet")){
RequestDispatcher rd = request.getRequestDispatcher("WelcomeServlet");
 rd.forward(request, response);
 }
 else{
 out.println("<body bgcolor=red >");
 out.println("<h1> Login Fail !!! </h1>");
 RequestDispatcher rd = request.getRequestDispatcher("index.html");
 rd.include(request, response);
 }
 out.println("</body>");out.println("</html>");
 }



WelcomeServlet.java


package mypack;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.RequestDispatcher;
public class LoginServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try{
       
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet WelcomeServlet</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Login Successfull</h1>");
            out.println("</body>");
            out.println("</html>");
        }
        catch(Exception ex)
        {
            out.println(ex.getMessage());
        }
    }

     
}



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